EP2547738B1 - Low temperature curing polyuretdione compositions - Google Patents

Low temperature curing polyuretdione compositions Download PDF

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Publication number
EP2547738B1
EP2547738B1 EP11756659.6A EP11756659A EP2547738B1 EP 2547738 B1 EP2547738 B1 EP 2547738B1 EP 11756659 A EP11756659 A EP 11756659A EP 2547738 B1 EP2547738 B1 EP 2547738B1
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Prior art keywords
polyol
weight
polyisocyanate
group
groups
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EP11756659.6A
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German (de)
English (en)
French (fr)
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EP2547738A4 (en
EP2547738A2 (en
Inventor
Myron W. Shaffer
Abdullah Ekin
Carol L. Kinney
Dorata GRESZTA-FRANZ
Jonathan T. Martz
Jun Deng
Deborah E. Hayes
Stephen J. Thomas
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Covestro Deutschland AG
Covestro LLC
PPG Industries Ohio Inc
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Covestro Deutschland AG
Covestro LLC
PPG Industries Ohio Inc
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/166—Catalysts not provided for in the groups C08G18/18 - C08G18/26
    • C08G18/168—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1883—Catalysts containing secondary or tertiary amines or salts thereof having heteroatoms other than oxygen and nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/20—Heterocyclic amines; Salts thereof
    • C08G18/2009—Heterocyclic amines; Salts thereof containing one heterocyclic ring
    • C08G18/2027—Heterocyclic amines; Salts thereof containing one heterocyclic ring having two nitrogen atoms in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/20—Heterocyclic amines; Salts thereof
    • C08G18/2045—Heterocyclic amines; Salts thereof containing condensed heterocyclic rings
    • C08G18/2063—Heterocyclic amines; Salts thereof containing condensed heterocyclic rings having two nitrogen atoms in the condensed ring system
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/22—Catalysts containing metal compounds
    • C08G18/24—Catalysts containing metal compounds of tin
    • C08G18/244—Catalysts containing metal compounds of tin tin salts of carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/44—Polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
    • C08G18/6225—Polymers of esters of acrylic or methacrylic acid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/798—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing urethdione groups

Definitions

  • the present disclosure relates to curable polyuretidione compositions and more particularly to polyuretidione-polyol compositions that cure at low temperatures.
  • the invention also relates to a coating process using the polyuretidione-polyol compositions with a low temperature curing step.
  • Polyisocyanates are well known low temperature curing agents for active hydrogen containing polymers such as polymeric polyols. However, special equipment must be used when handling the polyisocyanates and more particularly when handling curable compositions containing the polyisocyanates. The handling problems can be dealt with by blocking the polyisocyanates with a blocking agent such as a low molecular weight alcohol to form urethanes. However, high curing temperatures must be used in the curing reaction. Polyisocyanates may also be dimerized to form uretdiones that are known to dissociate to free isocyanates on thermal curing.
  • Document EP 0 761 705 A1 deals with a liquid coating composition that comprises a uretdione polyisocyanate, a polycaprolactone polyester polyol and DBU in solvent.
  • the compositions cure at temperatures from 100 to 350°C, preferably from 130 to 300°C. However, once again, high curing temperatures are required.
  • the present dislcosure provides for a low temperature (20-70°C) curable liquid composition
  • a low temperature (20-70°C) curable liquid composition comprising:
  • the invention also provides for a process for curing a liquid composition deposited on a substrate comprising:
  • any numerical range recited herein is intended to include all sub-ranges subsumed therein.
  • a range of "1 to 10" is intended to include all sub-ranges between (and including) the recited minimum value of 1 and the recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
  • polymer is also meant to include copolymer and oligomer.
  • the basicity of the catalyst is expressed in pKa units.
  • the pKa is determined in acetonitrile solvent.
  • Two (2) bases including the catalyst are used in the determination.
  • the difference in the pKa values is determined by monitoring the equilibria spectrophotometrically via Beer's law. An example of such a method is described in the Journal of Organic Chemistry 2005, 70, 1019-1028 .
  • Acrylic and methacrylic are designated as (meth)acrylic.
  • Aliphatic and cycloaliphatic are designated as (cyclo)aliphatic.
  • the uretdiones of the invention are typically obtained by catalytic dimerization of polyisocyanates by methods which are known in the art.
  • suitable polyisocyanates include diisocyanates such as linear aliphatic polyisocyanates, cycloaliphatic polyisocyanates and alkaryl polyisocyanates. Specific examples include 1,4-diisocyanatobutane, 4,4'-diisocyanatocyclohexylmethane (HMDI), isophorone diisocyanate (IPDI), 1,6-diisocyanatohexane (HDI), 1,3- and 1,4-bisisocyanatomethylcyclohexane, 1,3- and 1,4-xylylene diisocyanates (XDI) and mixtures thereof.
  • diisocyanates such as linear aliphatic polyisocyanates, cycloaliphatic polyisocyanates and alkaryl polyisocyanates. Specific examples include 1,4-diisocyanatobutane, 4,4'-diisocyanatocyclohexylmethane (HMDI), isophorone
  • dimerization catalysts are: trialkylphosphines, aminophosphines and aminopyradines such as dimethylaminopyridines, and tris(dimethylamino)phosphine, as well as any other dimerization catalyst known to those skilled in the art.
  • the result of the dimerization reaction depends, in a manner known to the skilled person, on the catalyst used, on the process conditions and on the polyisocyanates employed. In particular it is possible for products to be formed which contain on average more than one uretdione group per molecule, the number of uretdione groups being subject to a distribution.
  • Preferred uretdione compounds are prepared from the catalytic dimerization of HDI and/or IPDI.
  • the uretdiones may optionally contain isocyanurate, biuret, and/or iminooxadiazine dione groups in addition to the uretdione groups.
  • the uretdiones are NCO-functional compounds and are typically subjected to a further reaction, for example, blocking of the free NCO groups or further reaction of NCO groups with NCO-reactive compounds having a functionality of 2 or more to extend the uretdiones to form polyuretdione prepolymers.
  • Blocking agents suitable for example are alcohols, lactams, oximes, malonates, alkyl acetoacetates, triazoles, phenols, imidazoles, pyrazoles and amines, such as butanone oxime, diisopropylamine, 1,2,4-triazole, dimethyl-1,2,4-triazole, imidazole, diethyl malonate, ethyl acetoacetate, acetone oxime, 3,5-dimethylpyrazole, caprolactam, N-tert-butylbenzylamine and cyclopentanone including mixtures of these blocking agents.
  • NCO-reactive compounds with a functionality of two or more are polyols such as those described below.
  • the NCO-reactive compounds are used in amounts sufficient to react with all free NCO groups in the uretdione.
  • free NCO groups it is meant all NCO groups not present as part of the uretdione ring.
  • the resulting polyuretdione typically contains at least 2, such as from 2 to 10 uretdione groups. More typically the polyuretdione contains from 5 to 45% uretdione, 10 to 55 % urethane, and less than 2% isocyanate groups. The percentages are by weight based on total weight of resin containing uretdione, urethane, and/or isocyanate.
  • polyols useful in the practice can be either low or high molecular weight materials and in general will have average hydroxyl values as determined by ASTM designation E-222-67, Method B, between about 1000 and 10, and preferably between about 500 and 50.
  • polyol is meant to include materials having an average of two or more primary hydroxyl groups per molecule.
  • the polyols include low molecular weight diols, triols and higher alcohols and polymeric polyols such as polyester polyols, polyether polyols polyurethane polyols and hydroxy-containing (meth)acrylic polymers.
  • the low molecular weight diols, triols and higher alcohols useful in the instant invention are known in the art. For the most part they are monomeric and have hydroxy values of 200 and above, usually within the range of 1500 to 200.
  • Such materials include aliphatic polyols, particularly alkylene polyols containing from 2 to 18 carbon atoms. Examples include ethylene glycol, 1,4-butanediol, 1,6-hexanediol; cycloaliphatic polyols such as cyclohexane dimethanol.
  • triols and higher alcohols include trimethylol propane and pentaerythritol. Also useful are polyols containing either linkages such as diethylene glycol and triethylene glycol.
  • polymeric polyols are those having hydroxyl values less than 200, such as 10 to 180.
  • polymeric polyols include polyalkylene ether polyols, polyester polyols including hydroxyl-containing polycaprolactones, hydroxy-containing (meth)acrylic polymers, polycarbonate polyols and polyurethane polymers.
  • polyether polyols examples include poly(oxytetramethylene) glycols, poly(oxyethylene) glycols, and the reaction product of ethylene glycol with a mixture of propylene oxide and ethylene oxide.
  • polyether polyols formed from the oxyalkylation of various polyols, for example, glycols such as ethylene glycol, 1,4-butane glycol, 1,6-hexanediol, and the like, or higher polyols, such as trimethylol propane, pentaerythritol and the like.
  • glycols such as ethylene glycol, 1,4-butane glycol, 1,6-hexanediol, and the like
  • polyols such as trimethylol propane, pentaerythritol and the like.
  • One commonly utilized oxyalkylation method is by reacting a polyol with an alkylene oxide, for example, ethylene oxide in the presence of an acidic or basic catalyst.
  • Polyester polyols can also be used as a polymeric polyol component in the practice of the invention.
  • the polyester polyols can be prepared by the polyesterification of organic polycarboxylic acids or anhydrides thereof with organic polyols.
  • the polycarboxylic acids and polyols are aliphatic or aromatic dibasic acids and diols.
  • the diols which are usually employed in making the polyester include alkylene glycols, such as ethylene glycol and butylene glycol, neopentyl glycol and other glycols such as cyclohexane dimethanol, caprolactone diol (for example, the reaction product of caprolactone and ethylene glycol), polyether glycols, for example, poly(oxytetramethylene) glycol and the like.
  • alkylene glycols such as ethylene glycol and butylene glycol
  • neopentyl glycol and other glycols such as cyclohexane dimethanol
  • caprolactone diol for example, the reaction product of caprolactone and ethylene glycol
  • polyether glycols for example, poly(oxytetramethylene) glycol and the like.
  • other diols of various types and, as indicated, polyols of higher functionality can also be utilized.
  • Such higher polyols can include, for example, trimethylol propane, trimethylol ethane, pentaerythritol, and the like, as well as higher molecular weight polyols such as those produced by oxyalkylating low molecular weight polyols.
  • An example of such high molecular weight polyol is the reaction product of 20 moles of ethylene oxide per mole of trimethylol propane.
  • the acid component of the polyester consists primarily of monomeric carboxylic acids or anhydrides having 2 to 18 carbon atoms per molecule.
  • acids which are useful are phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, glutaric acid, chlorendic acid, tetrachlorophthalic acid and other dicarboxylic acids of varying types.
  • polycarboxylic acids such as trimellitic acid and tricarballylic acid (where acids are referred to above, it is understood that the anhydrides of those acids which form anhydrides can be used in place of the acid).
  • lower alkyl esters of acids such as dimethyl glutamate can be used.
  • polycaprolactone-type polyesters can also be employed. These products are formed from the reaction of a cyclic lactone such as epsilon-caprolactone with a polyol with primary hydroxyls such as those mentioned above. Such products are described in U.S. Pat. No. 3,169,949 to Hostettler.
  • hydroxy-containing (meth)acrylic polymers or (meth)acrylic polyols can be used as the polyol component.
  • the (meth)acrylic polymers are polymers of about 2 to 20 percent by weight primary hydroxy-containing vinyl monomers such as hydroxyalkyl acrylate and methacrylate having 2 to 6 carbon atoms in the alkyl group and 80 to 98 percent by weight of other ethylenically unsaturated copolymerizable materials such as alkyl (meth)acrylates; the percentages by weight being based on the total weight of the monomeric charge.
  • Suitable hydroxy alkyl (meth)acrylates are hydroxy ethyl and hydroxy butyl (meth)acrylate.
  • alkyl acrylates and (meth)acrylates examples include lauryl methacrylate, 2-ethylhexyl methacrylate and n-butyl acrylate.
  • ethylenically unsaturated materials such as monoolefinic and diolefinic hydrocarbons, halogenated monoolefinic and diolefinic hydrocarbons, unsaturated esters of organic and inorganic acids, amides and esters of unsaturated acids, nitriles and unsaturated acids and the like.
  • Examples of such monomers include styrene, 1,3-butadiene, acrylamide, acrylonitrile, alpha-methyl styrene, alpha-methyl chlorostyrene, vinyl butyrate, vinyl acetate, alkyl chloride, divinyl benzene, diallyl itaconate, triallyl cyanurate and mixtures thereof.
  • these other ethylenically unsaturated materials are used in admixture with the above-mentioned acrylates and methacrylates.
  • polyurethane polyols Besides the above-mentioned polymeric polyols, polyurethane polyols. These polyols can be prepared by reacting any of the above-mentioned polyols with a minor amount of polyisocyanate (OH/NCO equivalent ratio greater than 1:1) so that free primary hydroxyl groups are present in the product. In addition to the high molecular weight polyols mentioned above, mixtures of both high molecular weight and low molecular weight polyols such as those mentioned above may be used.
  • the organic isocyanate which is used to prepare the polyurethane polyols can be organic polyisocyanates having a molecular weight of 140 to 1500, preferably 168 to 318, such as 4,4'-diisocyanatocyclohexy-Imethane (HMDI), hexamethylene diisocyanate (HDI), 1-methyl-2,4(2,6)-diisocyanatocyclohexane or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane (IPDI) and mixtures thereof, preferably 4,4'-diisocyanatocyclohexylmethane (HMDI), 2,4- and/or 2,6-diisocyanatotoluene (TDI), 1-methyl-2,4- and/or -2,6-diisocyanatocyclohexane and 4,4'-diisocyanatodiphenylmethane (MDI),
  • polyisocyanate component may also contain known lacquer polyisocyanates based on HDI, IPDI and/or HMDI.
  • the polyisocyanate component may be in the form of a polyisocyanate adduct.
  • Suitable polyisocyanate adducts are those containing isocyanurate, uretdione, biuret, iminooxadiazine dione, carbodiimide and/or oxadiazinetrione groups.
  • the polyisocyanates adducts have an average functionality of 2 to 6, preferably 2 to 4, and an NCO content of 5 to 30% by weight, preferably 10 to 25% by weight and more preferably 15 to 25% by weight, and include:
  • Preferred polyisocyanate adducts are those containing isocyanurate, uretdione, biuret, and/or iminooxadiazine dione groups, especially polyisocyanates containing isocyanurate groups and optionally uretdione or iminooxadiazine dione groups.
  • aprotic means there is no hydrogen bonded to a primary or secondary amine.
  • the catalyst has a structure according to formula I:
  • Suitable catalysts include those selected from the group consisting of 1,8-diazabicyclo[5.4.0]undec-7ene, 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene, 1,4,5,6-tetrahydro-1,2-dimethyl pyrimidine, 1,2,4-triazole, sodium derivative and 2-tert-butyl-1,1,3,3-tetramethylguanidine.
  • the strong basic catalyst promotes crosslinking via reaction of the hydroxyl with the uretdione linkages resulting in the formation of allophanate crosslinks as opposed to the more conventional high temperature reaction of the uretdiones dissociating to form free isocyanate groups that react with the hydroxyl groups to form urethane crosslinks.
  • the allophanate group formation occurs at a temperature of 20 to 70°C such as 20 to 35°C.
  • the relative amounts of the polyuretdione and the polyol can vary somewhat depending on their respective molecular weights. Typically they can each be present in amounts within the range of 10 to 90% by weight based on resin solids weight of the polyuretdione and the polyol.
  • the equivalent ratio of hydroxyl to uretdione is typically from 0.5 to 1.5:1.
  • the catalyst is typically present in the composition in amounts of about 0.05 to 5% by weight based on weight of resin solids weight of the polyuretdione and the polyol.
  • compositions above may contain various optional ingredients.
  • these are fillers and reinforcing agents, for example calcium carbonate, silicates, talc, kaolin, mica and barium sulfate.
  • Other additives for example plasticizers, lubricants and rheological additives and solvent or diluent may be included in the compositions.
  • these optional ingredients may constitute up to 50% by weight of the composition based on total weight of the composition.
  • compositions of the present disclosure also contain a colorant.
  • colorant means any substance that imparts color and/or other opacity and/or other visual effect to the composition.
  • the colorant can be added to the coating in any suitable form, such as discrete particles, dispersions, solutions and/or flakes. A single colorant or a mixture of two or more colorants can be used in the coatings of the present invention.
  • Example colorants include pigments, dyes and tints, such as those used in the paint industry and/or listed in the Dry Color Manufacturers Association (DCMA), as well as special effect compositions.
  • a colorant may include, for example, a finely divided solid powder that is insoluble but wettable under the conditions of use.
  • a colorant can be organic or inorganic and can be agglomerated or non-agglomerated. Colorants can be incorporated into the coatings by use of a grind vehicle, such as an acrylic grind vehicle, the use of which will be familiar to one skilled in the art.
  • Example pigments and/or pigment compositions include, but are not limited to, carbazole dioxazine crude pigment, azo, monoazo, disazo, naphthol AS, salt type (lakes), benzimidazolone, condensation, metal complex, isoindolinone, isoindoline and polycyclic phthalocyanine, quinacridone, perylene, perinone, diketopyrrolo pyrrole, thioindigo, anthraquinone, indanthrone, anthrapyrimidine, flavanthrone, pyranthrone, anthanthrone, dioxazine, triarylcarbonium, quinophthalone pigments, diketo pyrrolo pyrrole red (“DPPBO red”), titanium dioxide, carbon black and mixtures thereof.
  • the terms "pigment” and "colored filler” can be used interchangeably.
  • Example dyes include, but are not limited to, those that are solvent and/or aqueous based such as phthalo green or blue, iron oxide, bismuth vanadate, anthraquinone, perylene, aluminum and quinacridone.
  • solvent and/or aqueous based such as phthalo green or blue, iron oxide, bismuth vanadate, anthraquinone, perylene, aluminum and quinacridone.
  • Example tints include, but are not limited to, pigments dispersed in water-based or water miscible carriers such as AQUA-CHEM 896 commercially available from Degussa, Inc., CHARISMA COLORANTS and MAXITONER INDUSTRIAL COLORANTS commercially available from Accurate Dispersions division of Eastman Chemical, Inc.
  • AQUA-CHEM 896 commercially available from Degussa, Inc.
  • CHARISMA COLORANTS and MAXITONER INDUSTRIAL COLORANTS commercially available from Accurate Dispersions division of Eastman Chemical, Inc.
  • the colorant can be in the form of a dispersion including, but not limited to, a nanoparticle dispersion.
  • Nanoparticle dispersions can include one or more highly dispersed nanoparticle colorants and/or colorant particles that produce a desired visible color and/or opacity and/or visual effect.
  • Nanoparticle dispersions can include colorants such as pigments or dyes having a particle size of less than 150 nm, such as less than 70 nm, or less than 30 nm. Nanoparticles can be produced by milling stock organic or inorganic pigments with grinding media having a particle size of less than 0.5 mm. Example nanoparticle dispersions and methods for making them are identified in U.S. Patent No. 6,875,800 B2 .
  • Nanoparticle dispersions can also be produced by crystallization, precipitation, gas phase condensation, and chemical attrition (i.e., partial dissolution).
  • a dispersion of resin-coated nanoparticles can be used.
  • a "dispersion of resin-coated nanoparticles” refers to a continuous phase in which is dispersed discreet "composite microparticles” that comprise a nanoparticle and a resin coating on the nanoparticle.
  • Example dispersions of resin-coated nanoparticles and methods for making them are identified in United States Patent Application Publication 2005-0287348 A1, filed June 24, 2004 , U.S. Provisional Application No. 60/482,167 filed June 24, 2003 , and United States Patent Application Serial No. 11/337,062, filed January 20, 2006 .
  • Example special effect compositions that may be used in the compositions of the present disclosure include pigments and/or compositions that produce one or more appearance effects such as reflectance, pearlescence, metallic sheen, phosphorescence, fluorescence, photochromism, photosensitivity, thermochromism, goniochromism and/or color-change. Additional special effect compositions can provide other perceptible properties, such as opacity or texture. In a non-limiting embodiment, special effect compositions can produce a color shift, such that the color of the coating changes when the coating is viewed at different angles. Example color effect compositions are identified in U.S. Patent No. 6,894,086 .
  • Additional color effect compositions can include transparent coated mica and/or synthetic mica, coated silica, coated alumina, a transparent liquid crystal pigment, a liquid crystal coating, and/or any composition wherein interference results from a refractive index differential within the material and not because of the refractive index differential between the primer of the material and the air.
  • the colorant can be present in any amount sufficient to impart the desired visual and/or color effect.
  • the colorant may comprise from 1 to 65 weight percent of the present compositions, such as from 3 to 40 weight percent or 5 to 35 weight percent, with weight percent based on the total weight of the compositions.
  • compositions of the disclosure can be employed for various purposes, for example as printing inks and as coatings for paper, wood, metal or plastic.
  • compositions of the disclosure for preparing protective and decorative coatings, such as exterior coatings on substrates of all kinds, for example buildings, fences, chipboard panels, and as a coating on stone, concrete or metal, for the coating of vehicles, for example, such as cars, railways or aircraft.
  • the compositions may likewise be used in automotive OEM finishing and automotive refinish, and also for the finishing of car bodies, plastic parts for cars and body-mounted car parts.
  • the initiators of the invention can be used in a multicoat system in the primer, base coat or clearcoat. Their use in pigmented topcoats is also possible.
  • the substrates can be coated by applying the composition as a liquid that may be 100% solids composition or as a solution or dispersion in a solvent or diluent.
  • the choice of solvent or diluent and the concentration depend predominantly on the choice of coating ingredients and the coating process.
  • the solvent or diluent should be inert. In other words, it should not undergo any chemical reaction with the components and should be capable of being removed after the coating operation in the curing process.
  • solvents or diluents examples include ketones, ethers and esters, such as methyl ethyl ketone, isobutyl methyl ketone, cyclopentanone, cyclohexanone, N-methylpyrrolidone, dioxane, tetrahydrofuran, 2-methoxyethanol, 2-ethoxyethanol, 1-methoxy-2-propanol, 1,2-dimethoxyethane, ethyl acetate, n-butyl acetate and ethyl 3-ethoxypropionate.
  • the solvent or diluent is typically present in amounts of 0 to 30% by weight based on total weight of the composition.
  • the coating composition may be applied uniformly to a substrate, for example by spin coating, dip coating, knife coating, curtain coating, brushing, spraying--especially electrostatic spraying--and reverse roll coating.
  • the coating compositions can be used as a primer, color coat or as a clearcoat.
  • Cure can be at ambient temperature or slightly above, typically from 20 to 70°C and 20 to 35°C.
  • the coating thickness is typically from 0.5 to 46 microns.
  • EtHex Dimer A polyuretdione prepolymer prepared from Desmodur ® N 3400 (polyisocyanate having uretdione and isocyanurate groups, prepared from HDI, available from Bayer MaterialScience LLC, Pittsburgh, PA) /2-ethyl-1,3-hexanediol/2-ethyl hexanol was prepared using a diol to monol equivalent ratio of 2.8:1 in sufficient amount to substantially consume any free isocyanate groups present. The resin was prepared at 50% solids in butyl acetate (BA), having a 1430 average uretdione equivalent weight.
  • BA butyl acetate
  • TMPD Dimer A polyuretdione prepolymer prepared from Desmodur ® N 3400 (polyisocyanate having uretdione and isocyanurate groups, prepared from HDI, available from Bayer MaterialScience LLC, Pittsburgh, PA) /2,2,4-trimethyl-1,3-pentanediol (TMPD)/2-ethyl hexanol was prepared using a diol to monol equivalent ratio of 2.8:1 in sufficient amount to substantially consume any free isocyanate groups present. The resin was prepared at 50% solids in BA, having a 1430 average uretdione equivalent weight.
  • This example illustrates the preparation of an acrylic polyol component.
  • a reaction vessel equipped stirrer, thermocouple, condenser and addition funnels equipped with pumps is charged with 269.2 grams (g) of ethyl-3-ethoxy propionate (EktaPro EEP from Eastman Chemical Products), 15.2 g n-butyl acetate and 5.5 g triphenyl phosphite and heated to reflux, about 160°C.
  • Two feeds, identified herein as A and B are next gradually added to the vessel over a period of three and four hours, respectively, while the contents of the vessel are maintained at reflux conditions.
  • Feed A consists of a mixture of 548.6 g Tone M-201 (caprolactone methacrylate), 274.4 g methyl methacrylate and 274.4 g styrene.
  • Feed B consists of a mixture of 65.8 g Luperox DTA (free radical initiator from Atochem) and 24.3 g n-butyl acetate. After the addition of the two feeds A and B is complete the addition funnels were rinsed with 30.0 g each of n-butyl acetate and the contents of the vessel are allowed to reflux for 1 hour. Thereafter, heating is discontinued, the contents of the vessel are allowed to cool and 150.0 g n-butyl acetate is added.
  • the resultant acrylic polyol has a total solids content measured for 1 hour at 110°C of 65.8 percent by weight; has a peak molecular weight of 6600, a weight average molecular weight of 10,200 and a number average molecular weight of 2016 as determined by gel permeation chromatography utilizing a polystyrene standard; has a Gardner-Holt viscosity of Z; has an acid value of 1.1; has a APHA color of.20; has a weight/gallon of 8.80; has a hydroxyl value of 83.3.
  • uretdione prepolymers and polyols were mixed in an 8-mL vial followed by addition of catalyst. Catalysts were added at 4% loading based on solids.
  • Catalysts were added at 4% loading based on solids.
  • 3,000 ⁇ L of EtHex uretdione solution, 1,4.40 ⁇ L of PA polyol solution were mixed first. Then, 782 ⁇ L of DBU solution was added on top of the uretdione and polyol mixture. Formulations were observed and the responses were recorded as follows:
  • Table 2 and Table 3 show the formulation responses of each catalyst with the uretdione to polyol equivalents of 0.8:1.0 and 1.2:1.0 respectively. It is clearly seen from Table 2 and Table 3 that the most active catalysts are triazole, 1872, DBU, and MeTBD. Table 2.
  • Table 4 shows catalyst responses at uretdione to polyol equivalent ratio of 1.0:1.0.
  • Table 4 shows catalyst responses at uretdione to polyol equivalent ratio of 1.0:1.0.
  • Table 4 shows catalyst responses at uretdione to polyol equivalent ratio of 1.0:1.0.
  • Example 1 The coating composition of Example 1 was diluted to 40.5% weight solids by the addition of n-Butyl acetate solvent. The sample was applied using a # 8 square draw down bar on pre-coated E-Coat 6061 primed cold rolled steel panels available from ACT Test Panels, Inc. of Hillsdale, Michigan. The sample was cured for 30 minutes at ambient temperature. The sample was also tested after curing for 30 minutes at 60°C. The results of the testing are reported below.
  • Example 2 formula was made and diluted to 35.4% weight solids by the addition of n-Butyl acetate solvent. The sample was applied using a # 8 square draw down bar on pre-coated E-Coat 6061 primed cold rolled steel panels available from ACT Test Panels, Inc. of Hillsdale, Michigan. The sample was cured for 30 minutes at ambient temperature. The sample was also tested after curing for 30 minutes at 60°C. The results of the testing are reported below.
  • EXAMPLE Surface Tack 1 24 hrs. Ambient
  • Surface Tack 1 (30'@ 60°C)
  • MEK Double Rubs 2 24 hrs. Ambient)
  • MEK Double Rubs (30'@ 60°C)

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  • Polymers & Plastics (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
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US20110229645A1 (en) 2011-09-22
WO2011115669A3 (en) 2012-01-05
SG183802A1 (en) 2012-10-30
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CA2792995A1 (en) 2011-09-22
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WO2011115669A8 (en) 2012-10-18
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NZ602431A (en) 2013-09-27
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AU2011227738B2 (en) 2015-09-10
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AU2011227738A1 (en) 2012-09-20
JP6147807B2 (ja) 2017-06-14
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ES2648883T3 (es) 2018-01-08
KR20130048288A (ko) 2013-05-09
US9080074B2 (en) 2015-07-14

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